ABSTRACT

The enthalpies of solution DsolHm m were determined for N,N,N0,N0-tetramethylurea in formamide, N-methylformamide, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulphoxide, and acetone. Measurements were made at 298.15 K and molalities m = (0.004 to 0.031) mol kg 1 with a precise isoperibol ampoule-type calorimeter. Standard enthalpies of solution DsolH m and transfer DtrH m from one solvent to another were computed. The enthalpies of solution of the solute in the hydrogen-non-bonding media were found to be endothermic and weak depending on the nature of methylation in a solvent molecule. It was concluded that the solvent proton-donor ability and existing steric hindrances for hydrogen bonding and other intermolecular interactions play the key role in solvation of tetramethylurea. 2008 Elsevier Ltd. All rights reserved.

Compounds

#	Formula	Name
1	C5H12N2O	tetramethylurea
2	H2O	water
3	CH3NO	formamide
4	C2H5NO	N-methylformamide
5	C3H7NO	dimethylformamide
6	C4H9NO	N,N-dimethylethanamide
7	C2H6OS	dimethyl sulfoxide
8	C3H6O	acetone

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:6	1
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:4	1
POMD	4	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:6	1
POMD	5	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:4	1
POMD	6	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:2	1
POMD	7	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:2	1
POMD	8	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	VIBTUB:UFactor:2	1
POMD	3 1	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	6
POMD	4 1	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	6
POMD	5 1	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	6
POMD	6 1	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	6
POMD	7 1	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	6
POMD	8 1	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	ISOPERIBOL	6
POMD	1 2	Molar enthalpy of solution, kJ/mol ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	ISOPERIBOL	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Enthalpies of solution of N,N,N0,N0-tetramethylurea in amides, dimethylsulphoxide, and acetone at 298.15 K

Ivanov, E. V.[Evgeniy V.], Smirnov, V. I.[Valeriy I.]

ABSTRACT